Update High Traffic table list

What does this MR do and why?

This MR updates our High Traffic tables list with new tables > 10 GB.

I've used the following command on a thin clone to get those numbers 👇

SELECT pg_size_pretty( pg_total_relation_size(TABLE_NAME));

table name	size
approvals	10 GB
deployment_merge_requests	10 GB
diff_note_positions	18 GB
pm_package_version_licenses	14 GB
merge_request_user_mentions	17 GB
oauth_access_grants	23 GB
oauth_access_tokens	108 GB
pm_package_versions	11 GB
pm_package_version_licenses	14 GB
project_statistics	13 GB
sbom_occurrences	16 GB
security_scans	35 GB
user_agent_details	11 GB
vulnerability_finding_links	91 GB

MR acceptance checklist

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